app.js

var config = require('./config')('/tmp/etc/new.conf')

config.js

var fs = require('fs');

module.exports = function (FILEPATH) {
  var config = { };
  
  try {
      if (fs.existsSync(FILEPATH)) {
          var poolEnv = fs.readFileSync(FILEPATH, {encoding: 'utf8'});
          if (typeof poolEnv === 'string' && poolEnv.length) {
              poolEnv = poolEnv.replace(rtrim, '');
              if(poolEnv === 'curr') {
                  config.env = 'production'
              } else if(poolEnv === 'next') {
                  config.env = 'stage'
              }
              config.configDir = '/tmp/iot';
          }
      }
  } catch (err) {
      console.log("Error reading new.conf file");
  }
  
  return config;
};